feat: run cargo build with --timings and record them in CI

.github/workflows/rust-ci.yml

@@ -380,7 +380,15 @@ jobs:
           cargo chef cook --recipe-path "$RECIPE" --target ${{ matrix.target }} --release --all-features
 
       - name: cargo clippy
-        run: cargo clippy --target ${{ matrix.target }} --all-features --tests --profile ${{ matrix.profile }} -- -D warnings
+        run: cargo clippy --target ${{ matrix.target }} --all-features --tests --profile ${{ matrix.profile }} --timings -- -D warnings
+
+      - name: Upload Cargo timings (clippy)
+        if: always()
+        uses: actions/upload-artifact@v6
+        with:
+          name: cargo-timings-rust-ci-clippy-${{ matrix.target }}-${{ matrix.profile }}
+          path: codex-rs/target/**/cargo-timings/cargo-timing.html
+          if-no-files-found: warn
 
       # Save caches explicitly; make non-fatal so cache packaging
       # never fails the overall job. Only save when key wasn't hit.
@@ -567,11 +575,19 @@ jobs:
 
       - name: tests
         id: test
-        run: cargo nextest run --all-features --no-fail-fast --target ${{ matrix.target }} --cargo-profile ci-test
+        run: cargo nextest run --all-features --no-fail-fast --target ${{ matrix.target }} --cargo-profile ci-test --timings
         env:
           RUST_BACKTRACE: 1
           NEXTEST_STATUS_LEVEL: leak
 
+      - name: Upload Cargo timings (nextest)
+        if: always()
+        uses: actions/upload-artifact@v6
+        with:
+          name: cargo-timings-rust-ci-nextest-${{ matrix.target }}-${{ matrix.profile }}
+          path: codex-rs/target/**/cargo-timings/cargo-timing.html
+          if-no-files-found: warn
+
       - name: Save cargo home cache
         if: always() && !cancelled() && steps.cache_cargo_home_restore.outputs.cache-hit != 'true'
         continue-on-error: true

.github/workflows/rust-release-windows.yml

@@ -89,7 +89,14 @@ jobs:
       - name: Cargo build (Windows binaries)
         shell: bash
         run: |
-          cargo build --target ${{ matrix.target }} --release ${{ matrix.build_args }}
+          cargo build --target ${{ matrix.target }} --release --timings ${{ matrix.build_args }}
+
+      - name: Upload Cargo timings
+        uses: actions/upload-artifact@v6
+        with:
+          name: cargo-timings-rust-release-windows-${{ matrix.target }}-${{ matrix.bundle }}
+          path: codex-rs/target/**/cargo-timings/cargo-timing.html
+          if-no-files-found: warn
 
       - name: Stage Windows binaries
         shell: bash

.github/workflows/rust-release.yml

@@ -205,7 +205,14 @@ jobs:
       - name: Cargo build
         shell: bash
         run: |
-          cargo build --target ${{ matrix.target }} --release --bin codex --bin codex-responses-api-proxy
+          cargo build --target ${{ matrix.target }} --release --timings --bin codex --bin codex-responses-api-proxy
+
+      - name: Upload Cargo timings
+        uses: actions/upload-artifact@v6
+        with:
+          name: cargo-timings-rust-release-${{ matrix.target }}
+          path: codex-rs/target/**/cargo-timings/cargo-timing.html
+          if-no-files-found: warn
 
       - if: ${{ contains(matrix.target, 'linux') }}
         name: Cosign Linux artifacts